MAX767 ,5V to 3.3V Output, Synchronous, Step-Down Power Supply ControllerApplicationsPART TEMP. RANGEPACKAGE TOL (V)Local 5V-to-3.3V DC-DC ConversionMAX767CAP 0°C to +70°C ..
MAX767CAP ,5V-to-3.3V, Synchronous, Step-Down Power-Supply ControllerMAX76719-0224; Rev 2; 8/945V-to-3.3V, Synchronous, Step-Down Power-Supply Controller_______________
MAX767CAP+ ,5V to 3.3V Output, Synchronous, Step-Down Power Supply ControllerApplicationsPART TEMP. RANGEPACKAGE TOL (V)Local 5V-to-3.3V DC-DC ConversionMAX767CAP 0°C to +70°C ..
MAX767CAP-T ,5V to 3.3V Output, Synchronous, Step-Down Power Supply Controllerfeatures set♦ 120µA Standby Supply Currentthis device apart from similar, low-voltage step-down♦ 4. ..
MAX767EAP ,5V-to-3.3V, Synchronous, Step-Down Power-Supply ControllerMAX76719-0224; Rev 2; 8/945V-to-3.3V, Synchronous, Step-Down Power-Supply Controller_______________
MAX767EAP+ ,5V to 3.3V Output, Synchronous, Step-Down Power Supply ControllerFeatures♦ >90% EfficiencyThe MAX767 is a high-efficiency, synchronous buckcontroller IC dedicated t ..
MB6M ,MINIATURE GLASS PASSIVATED SINGLE-PHASE BRIDGE RECTIFIERThermal Characteristics (TA = 25°C unless otherwise noted)Parameter Symbol MB2M MB4M MB6M UnitDevic ..
MB6S ,Bridge RectifiersThermal Characteristics (T = 25°C unless otherwise noted)AParameter Symbol MB2S MB4S MB6S UnitDevic ..
MB7117E , Schottky TTL 2048-Bit Bipolar Programmable Read-Only Memory
MB71A38-25 , PROGRAMMABLE SCHOTTKY 16384-BIT READ ONLY MEMORY
MAX767
5V to 3.3V Output, Synchronous, Step-Down Power Supply Controller
________________General DescriptionThe MAX767 is a high-efficiency, synchronous buck
controller IC dedicated to converting a fixed 5V supply
into a tightly regulated 3.3V output. Two key features set
this device apart from similar, low-voltage step-down
switching regulators: high operating frequency and all
N-channel construction in the application circuit. The
300kHz operating frequency results in very small, low-
cost external surface-mount components.
The inductor, at 3.3µH for 5A, is physically at least five
times smaller than inductors found in competing solu-
tions. All N-channel construction and synchronous rectifi-
cation result in reduced cost and highest efficiency.
Efficiency exceeds 90% over a wide range of loading,
eliminating the need for heatsinking. Output capacitance
requirements are low, reducing board space and cost.
The MAX767 is a monolithic BiCMOS IC available in
20-pin SSOP packages. For other fixed output voltages
and package options, please consult the factory.
________________________ApplicationsLocal 5V-to-3.3V DC-DC Conversion
Microprocessor Daughterboards
Power Supplies up to 10A or More
____________________________Features>90% Efficiency700µA Quiescent Supply Current120µA Standby Supply Current4.5V-to-5.5V Input RangeLow-Cost Application CircuitAll N-Channel SwitchesSmall External ComponentsTiny Shrink-Small-Outline Package (SSOP)Predesigned Applications:
Standard 5V to 3.3V DC-DC Converters up to 10A
High-Accuracy Pentium P54C VR-Spec SupplyFixed Output Voltages Available:
3.3V (Standard)
3.45V (High-Speed Pentium™)
3.6V (PowerPC™)
_______________Ordering Information
MAX767-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
__________________Pin Configuration
_________Typical Application CircuitPentium is a trademark of Intel. PowerPC is a trademark of IBM.
Ordering Information continued at end of data sheet.Contact factory for dice specifications.
MAX767
5V-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
ABSOLUTE MAXIMUM RATINGSStresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
VCCto GND.................................................................-0.3V, +7V
PGND to GND........................................................................±2V
BST to GND...............................................................-0.3V, +15V
LX to BST.....................................................................-7V, +0.3V
Inputs/Outputs to GND
(ON, REF, SYNC, CS, FB, SS).....................-0.3V, VCC+ 0.3V
DL toPGND.....................................................-0.3V, VCC+ 0.3V
DH to LX...........................................................-0.3V, BST + 0.3V
REF Short to GND.......................................................Momentary
REF Current.........................................................................20mA
Continuous Power Dissipation (TA= +70°C)
20-Pin SSOP (derate 8.00mW/°C above +70°C)..........640mW
Operating Temperature Ranges:
MAX767CAP/MAX767_CAP.................................0°C to +70°C
MAX767EAP/MAX767_EAP..............................-40°C to +85°C
Lead Temperature (soldering, 10s).................................+300°C
ELECTRICAL CHARACTERISTICS(VCC= ON = 5V, GND = PGND = SYNC = 0V, IREF= 0mA, TA= TMINto TMAX, unless otherwise noted. Typical values are at TA= +25°C.)
MAX767
5V-to-3.3V, Synchronous, Step-Down
Power-Supply ControllerEFFICIENCY vs. OUTPUT CURRENT
(1.5A CIRCUIT)
MAX767-01
OUTPUT CURRENT (A)
EFFICIENCY (%)70
EFFICIENCY vs. OUTPUT CURRENT
(3A CIRCUIT)
MAX767-02
OUTPUT CURRENT (A)
EFFICIENCY (%)70
EFFICIENCY vs. OUTPUT CURRENT
(5A CIRCUIT)
MAX767-03
OUTPUT CURRENT (A)
EFFICIENCY (%)70
EFFICIENCY vs. OUTPUT CURRENT
(7A CIRCUIT)
MAX767-04
OUTPUT CURRENT (A)
EFFICIENCY (%)70
IDLE-MODE WAVEFORMS
ILOAD = 300mA
3.3V OUTPUT
50mV/div, AC COUPLED
5V/div
5µs/div
EFFICIENCY vs. OUTPUT CURRENT
(10A CIRCUIT)
MAX767-05
OUTPUT CURRENT (A)
EFFICIENCY (%)70
SWITCHING FREQUENCY vs.
PERCENT OF FULL LOAD
MAX767-06
LOAD CURRENT (% FULL LOAD)
SWITCHING FREQUENCY (kHz)
PWM-MODE WAVEFORMS
ILOAD = 5A
3.3V OUTPUT
50mV/div, AC COUPLED
5V/div
1µs/div
__________________________________________Typical Operating Characteristics(Circuit of Figure 1 (5A configuration), VIN= 5V, oscillator frequency = 300kHz, TA= +25°C, unless otherwise noted.)
MAX767
5V-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
_____________________________Typical Operating Characteristics (continued)(Circuit of Figure 1 (5A configuration), VIN= 5V, oscillator frequency = 300kHz, TA= +25°C, unless otherwise noted.)
MAX767
5V-to-3.3V, Synchronous, Step-Down
Power-Supply Controller
______________________________________________________________Pin Description
